Text and Data Mining valid from 2019-07-10
Received: 27 March 2019
Revised: 6 June 2019
Accepted: 1 July 2019
First Online: 10 July 2019
Compliance with ethical standards
: The work is a literature review and complied with the tenets of the Declaration of Helsinki, as well as with the ethical standards of the journal.
: Giuseppe Plazzi participated in advisory board for UCB Pharma, Jazz pharmaceuticals, Bioprojet, and Idorsia outside the submitted work. The other authors have no potential financial conflict of interest to disclose.